HERE is a good guide to shipping wheels and tires.
You can get a better rate using NEX, but be aware of handling fees. I shipped a set of four 18" wheels with tires from Indiana to New York for $156. That included pick up at my house and residential delivery. I packaged them as shown in the link above and they were delivered without any issue. But be aware of extra handling charges they tend to charge you a month later at $9 a wheel. I packed as shown, but didn't then put each wheel in a box after I covered with cardboard and was charged $36 handling fees.
Additional Handling applies to the following:
• Any article that is encased in an outside shipping container made of metal, wood, luggage or shipments not encased in cardboards.
• Any cylindrical item, such as a barrel, drum, pail, or tire, that is not fully encased in a corrugated cardboard shipping container
• Any package with the longest side exceeding 60 inches or its second-longest side exceeding 30 inches
• Any package with an actual weight greater than 70 pounds
• Each package in a shipment where the average weight per package is greater than 70 pounds and the weight for each package is not specified on the source document or the NEX automated shipping system used